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TM 9-2320-364-20-2
2-858
5. CODE 21: THROTTLE SENSOR INOPERATIVE (CONT).
“CHECK TRANS” light ON.
“DO NOT SHIFT” light OFF.
“DO NOT SHIFT” light will not
go out at start up.
Transmission shifts delayed
or hard.
Throttle position sensor
count OK.
Wire 908 OK.
Wire(s) 104, 106A, and 124 OK.
DDEC ECM OK.
Throttle position control faulty.
Transmission ECU faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If there is no pulse modulated
signal count from throttle
position control module M4
terminal B to ECU, ATEC ECU
will register a code 21 fault.
YES
NO
Replace throttle
position control
module (Para. 7-98).
Verify repair, go to
Step 6 of this Fault.
5.
Does voltage at connector
MC36, terminal B decrease to
5.0 to 5.8 vdc with throttle
fully applied?
Replace transmission
ECU (Para 7-71).
Verify repair, go to
Step 6 of this Fault.
WARNING
Read WARNING
on Page 2-859
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